I have the same issue.
1419274560
1419088999
1419007324
1418433942
It appears to be what my company refers to as a "peak time" issue with your movies and tv service. Evenings and weekends make movies unwatchable. My bandwidth is fine, and I've had no issues with other streaming apps.
My wife and I have spent a few hundred dollars on movies that we can't seem to watch during our free time. Chat support has been less than adequate to say the least, and I desperately would like to be able to watch the content that I've paid for.
No one seems to be taking this seriously. You (Microsoft) have ZERO documentation on what this error code means, and getting this matter escalated to someone that might be able to do something about it has been like pulling teeth (and that's being generous).
Please help.